mirror of
https://github.com/sjlongland/atinysynth.git
synced 2025-09-13 18:13:16 +10:00
c19c6dddcb
- Added waveform generic API to create waveforms, and use period instead of frequency in waveform (avoid division on MCUs) - Introduced 'def' struct in ADSR API for reuse - Multi-track MML parser and compilation - Added some samples from https://electronicmusic.fandom.com/wiki/Music_Macro_Language - Added scale.mml for testing
89 lines
2.9 KiB
C
89 lines
2.9 KiB
C
/*!
|
|
* Polyphonic synthesizer for microcontrollers.
|
|
* (C) 2021 Luciano Martorella
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
|
|
* MA 02110-1301 USA
|
|
*/
|
|
#ifndef _SEQUENCER_H
|
|
#define _SEQUENCER_H
|
|
|
|
#include "adsr.h"
|
|
#include "waveform.h"
|
|
#include "synth.h"
|
|
|
|
/*!
|
|
* Define a single step/frame of the sequencer. It applies to the active channel.
|
|
* Contains the definition of the next waveform and envelope.
|
|
* 16 bytes
|
|
*/
|
|
struct seq_frame_t {
|
|
/*! Envelope definition */
|
|
struct adsr_env_def_t adsr_def;
|
|
/*! Waveform definition */
|
|
struct voice_wf_def_t waveform_def;
|
|
};
|
|
|
|
struct seq_stream_header_t {
|
|
/*! Sampling frequency required for correct timing */
|
|
uint16_t synth_frequency;
|
|
/*! Number of voices. They will all be enabled */
|
|
uint8_t voices;
|
|
/*! Total frame count */
|
|
uint16_t frames;
|
|
/*! Follow frames data, as stream of seq_frame_t */
|
|
};
|
|
|
|
/*!
|
|
* Plays a stream sequence of frames, in the order requested by the synth.
|
|
* The frames must then be sorted in the same fetch order and not in channel order.
|
|
* Frames will be fed using the handler passed by `seq_set_stream_require_handler`.
|
|
*/
|
|
int seq_play_stream(const struct seq_stream_header_t* stream_header, uint8_t voice_count, struct poly_synth_t* synth);
|
|
|
|
/*! Requires a new frame. The handler must return 1 if a new frame was acquired, or zero if EOF */
|
|
void seq_set_stream_require_handler(uint8_t (*handler)(struct seq_frame_t* frame));
|
|
|
|
/*! Use it when `seq_play_stream` is in use, must be called at every sample */
|
|
void seq_feed_synth(struct poly_synth_t* synth);
|
|
|
|
/*! List of frames, used by `seq_frame_map_t` */
|
|
struct seq_frame_list_t {
|
|
/*! Frame count */
|
|
int count;
|
|
/*! List of frames */
|
|
struct seq_frame_t* frames;
|
|
};
|
|
|
|
/*!
|
|
* A frame map is an intermediate data in which frames are organized by channel.
|
|
* Typically requires dynamic memory allocation (heap) to allocate the whole tune
|
|
* upfront.
|
|
*/
|
|
struct seq_frame_map_t {
|
|
/*! Channel count */
|
|
int channel_count;
|
|
/*! Array of frame lists */
|
|
struct seq_frame_list_t* channels;
|
|
};
|
|
|
|
/*! Compile/reorder a frame-map (by channel) to a sequential stream */
|
|
void seq_compile(struct seq_frame_map_t* map, struct seq_frame_t** frame_stream, int* frame_count, int* voice_count);
|
|
|
|
/*! Free the stream allocated by `seq_compile`. */
|
|
void seq_free(struct seq_frame_t* frame_stream);
|
|
|
|
#endif
|